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1-10 of 13 messages
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Decoding internet code transmissions
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by N4TTQ on October 18, 2008
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I was just wondering if there are any internet sites that carry code transmissions, i.e. cw, rtty, ect. that can be decoded on my computer using software like CWcom or some other?
Idealy, I would like the computer to decode the received signal and make it readible on the screen as it is received by me.
Thanks,
Rick
N4TTQ
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RE: Decoding internet code transmissions
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by N3OX on October 18, 2008
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"Idealy, I would like the computer to decode the received signal and make it readible on the screen as it is received by me.
"
Huh?
You want to use RTTY over the internet?
The internet is TTY ;-)
Tell us more about what you want to do. Do you want to hear transmissions and have them decoded so you can compare, or do you just want to type with someone in real time?
73
Dan
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RE: Decoding internet code transmissions
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by N4TTQ on October 18, 2008
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At this point, I would just like to receive live transmissions and have them decoded.
73
Rick
N4TTQ
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RE: Decoding internet code transmissions
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by K5END on October 19, 2008
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TTY and RTTY are just primitive real-time analog signals originally intended to drive a remote mechanical typewriter. Today, a sound card and software can simulate that mechanical receiver and display or record text on a computer.
IP-based networks, such as the internet, are not "time-domain" media and are not a real-time paradigm. Today's technology is getting good enough to almost fake a real time environment, and protocols such as MPLS are faking it to the point of pretty darn close (20 milliseconds on a good day,) but to send TTY or RTTY over the internet would require another application level to simulate the real-time analog signal.
That would be like crop dusting with an SR-71, but it could be done by either sending audio files or some other method like VOIP. I have my doubts about using VOIP, for the following reason, among others. The human ear can ignore the harmonic noise generated by the pulse-code modulation of an audio signal, but a modem hears the human equivalent of fingernails scratching a chalkboard. Also, according to the Nyquist theorem, the bandwidth would be limited by VOIP for most modulation. TTY is pretty primitive, so I don't know.
There are other ways of faking a TTY signal, but what is the goal? Why reinvent the stone knife?
As far as CW, you mean "Morse code." Nonetheless, there are some "CW IRC" methods. I've looked into that, and you'll get some good help on here if you want to do it.
That looks like fun, and would be a good way to practice Morse code. It's on my to do list, but I've been practicing copy by using G4FON and by tuning to 40 and 80 meters and listening for anything below 15 WPM and copying with a typewriter.
Last night around 7.050 MHz I heard part of a QSO about going to an EPISCOPAL Church. But Supper was ready and I didn't get the details.
However, out of reverence, I did choose an ecumenical acronym and had a PEPSICOLA with dinner.
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RE: Decoding internet code transmissions
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by KB9CRY on October 19, 2008
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internet sites that carry code transmissions
No but an amateur radio with an antenna does.
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RE: Decoding internet code transmissions
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by K5END on October 19, 2008
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By the way, there are bricks, radios and software applications that will TAKE a REAL, bonafide, QSO, off-the-air ham CW signal in audio form from your sound card and decode it, as opposed to faking a CW QSO on the internet.
Could be a decoding application product slogan:
"CW: Take it, don't fake it."
...hahaha...
I've never tried it, but they say it works OK as long as the sender sends code cleanly.
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RE: Decoding internet code transmissions
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by N4TTQ on October 19, 2008
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I have not been an active ham for sometime. Short of that, I had been licensed for over 20 years. Up until now, I have found hams to be helpful and not condescending when replying to an honest question posed by another ham.
The other hams who answered my question answered it in good faith. You apparently felt ridicule was your only approach.
Thanks to the other respondents for their answers. You both typify what being an amateur radio operator should be.
Rick
N4TTQ
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RE: Decoding internet code transmissions
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by K5END on October 19, 2008
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I hope you aren't referring to my post(s) as ridicule.
There's nothing in them that ridicules you.
If anything in my post(s) on this thread has been interpreted that way, please let me know and I will reword it.
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RE: Decoding internet code transmissions
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by KB9CRY on October 19, 2008
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And my answer is very direct and gives an option.
I know of no site that has recorded transmissions of digital modes (there are many personal sites and some DX sites that offer short snippets of transmission).
And I gave the best answer I knew of.
One poster gave a technical treatise of the modes and never really answered the question and gave the same suggestion as I.
I then offered a very viable alternative which has a mulitude of transmissions to decode.
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RE: Decoding internet code transmissions
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by K5END on October 19, 2008
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By the way, check the ARRL website for MP3 files for Morse code practice.
You can download them and try to have your pc decode them.
This is the link to that site:
http://www.arrl.org/w1aw/morse.html
You can also download other Morse code "tutoring" software for learning to copy code. G4FON is one I've been using so far, but there are many others.
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